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|Title:||Gold nanoparticles supported on functionalized mesoporous silica for selective oxidation of cyclohexane||Authors:||Wu, P.
|Issue Date:||May-2011||Citation:||Wu, P., Bai, P., Lei, Z., Loh, K.P., Zhao, X.S. (2011-05). Gold nanoparticles supported on functionalized mesoporous silica for selective oxidation of cyclohexane. Microporous and Mesoporous Materials 141 (1-3) : 222-230. ScholarBank@NUS Repository. https://doi.org/10.1016/j.micromeso.2010.11.011||Abstract:||Gold (Au) nanoparticles of sizes in the range of 2-4 nm dispersed on ordered mesoporous silica were prepared via a one-pot synthesis route in the presence of organosilane mercapto-propyl-trimethoxysilane (MPTMS). MPTMS was found to play a dual role: one was to coordinate the Au precursor (AuCl4-) via its thiol ligands and the other one was to form covalent bonds with the silica matrix. The interaction of the Au species with MPTMS was studied using real-time ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy techniques. The formation of Au (I)-thiolate complexes in the synthesis gel was identified and found to play a crucial role in the dispersion of the final Au nanoparticles on the support. The Au nanoparticles dispersed on the mesoporous silica exhibited high catalytic activity and selectivity in solvent-free selective oxidation of cyclohexane using molecular oxygen. © 2010 Elsevier Inc. All rights reserved.||Source Title:||Microporous and Mesoporous Materials||URI:||http://scholarbank.nus.edu.sg/handle/10635/63985||ISSN:||13871811||DOI:||10.1016/j.micromeso.2010.11.011|
|Appears in Collections:||Staff Publications|
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